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Theorem pnfnre 7994
Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.)
Assertion
Ref Expression
pnfnre  |- +oo  e/  RR

Proof of Theorem pnfnre
StepHypRef Expression
1 cnex 7931 . . . . . 6  |-  CC  e.  _V
21uniex 4436 . . . . 5  |-  U. CC  e.  _V
3 pwuninel2 6279 . . . . 5  |-  ( U. CC  e.  _V  ->  -.  ~P U. CC  e.  CC )
42, 3ax-mp 5 . . . 4  |-  -.  ~P U. CC  e.  CC
5 df-pnf 7989 . . . . 5  |- +oo  =  ~P U. CC
65eleq1i 2243 . . . 4  |-  ( +oo  e.  CC  <->  ~P U. CC  e.  CC )
74, 6mtbir 671 . . 3  |-  -. +oo  e.  CC
8 recn 7940 . . 3  |-  ( +oo  e.  RR  -> +oo  e.  CC )
97, 8mto 662 . 2  |-  -. +oo  e.  RR
109nelir 2445 1  |- +oo  e/  RR
Colors of variables: wff set class
Syntax hints:   -. wn 3    e. wcel 2148    e/ wnel 2442   _Vcvv 2737   ~Pcpw 3575   U.cuni 3809   CCcc 7805   RRcr 7806   +oocpnf 7984
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4120  ax-un 4432  ax-cnex 7898  ax-resscn 7899
This theorem depends on definitions:  df-bi 117  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-nel 2443  df-rex 2461  df-rab 2464  df-v 2739  df-in 3135  df-ss 3142  df-pw 3577  df-uni 3810  df-pnf 7989
This theorem is referenced by:  renepnf  8000  nn0nepnf  9242  xrltnr  9774  pnfnlt  9782  xnn0lenn0nn0  9860  inftonninf  10435  pcgcd1  12318  pc2dvds  12320
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